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/*
* Copyright 2019 Google Inc.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef OPEN_SOURCE_MESSAGE_SINK_H_
#define OPEN_SOURCE_MESSAGE_SINK_H_
#include "absl/memory/memory.h"
#include "private_join_and_compute.pb.h"
#include "util/status.inc"
namespace private_join_and_compute {
// An interface for message sinks.
template <typename T>
class MessageSink {
public:
virtual ~MessageSink() = default;
// Subclasses should accept a message and process it appropriately.
virtual Status Send(const T& message) = 0;
protected:
MessageSink() = default;
};
// A dummy message sink, that simply stores the last message received, and
// allows retrieval. Intended for testing.
template <typename T>
class DummyMessageSink : public MessageSink<T> {
public:
~DummyMessageSink() override = default;
// Simply copies the message.
Status Send(const T& message) override {
last_message_ = absl::make_unique<T>(message);
return OkStatus();
}
// Will fail if no message was received.
const T& last_message() { return *last_message_; }
private:
std::unique_ptr<T> last_message_;
};
} // namespace private_join_and_compute
#endif // OPEN_SOURCE_MESSAGE_SINK_H_
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